Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
6426
CALL
Organogenesis Holdings
ORGO
$324M
| $35K | ﹤0.01% |
8,600
+2,300
| +37% | +$6.44K |
|
6427
Avita Medical
RCEL
$137M
| $35K | ﹤0.01% |
+2,566
| New | +$29.4K |
|
6428
Rentokil
RTO
$14.8B
| $35K | ﹤0.01% |
1,225
+1,020
| +498% | +$30K |
|
6429
Sonic Automotive
SAH
$3.56B
| $35K | ﹤0.01% |
624
+408
| +189% | +$20.4K |
|
|
STKL
6430
CALL
DELISTED
SunOpta
STKL
| $35K | ﹤0.01% |
6,500
+6,200
| +2,067% | +$27.1K |
|
6431
PUT
Vericel Corp
VCEL
$2.38B
| $35K | ﹤0.01% |
1,000
-1,300
| -57% | -$45.3K |
|
6432
VTEX
VTEX
$767M
| $35K | ﹤0.01% |
5,129
-2,237
| -30% | -$13.7K |
|
6433
PUT
Wabash National
WNC
$504M
| $35K | ﹤0.01% |
1,400
+500
| +56% | +$11.3K |
|
|
ONIT
6434
Onity Group
ONIT
$342M
| $35K | ﹤0.01% |
1,139
-5,972
| -84% | -$153K |
|
|
OKUR
6435
CALL
OnKure Therapeutics
OKUR
$160M
| $35K | ﹤0.01% |
2,210
+2,170
| +5,425% | +$135K |
|
|
EGIO
6436
DELISTED
Edgio, Inc. Common Stock
EGIO
| $35K | ﹤0.01% |
2,586
-357
| -12% | -$8.8K |
|
|
SBDS
6437
DELISTED
Solo Brands Inc
SBDS
| $35K | ﹤0.01% |
145
-730
| -83% | -$142K |
|
6438
CALL
Acurx Pharmaceuticals
ACXP
$5.97M
| $34K | ﹤0.01% |
+455
| New | +$34.3K |
|
|
AGS
6439
DELISTED
PlayAGS
AGS
| $34K | ﹤0.01% |
4,044
+2,283
| +130% | +$16.9K |
|
6440
CALL
AdaptHealth
AHCO
$1.47B
| $34K | ﹤0.01% |
4,800
-36,100
| -88% | -$285K |
|
6441
PUT
Atmos Energy
ATO
$29.7B
| $34K | ﹤0.01% |
300
-600
| -67% | -$67K |
|
6442
CALL
Black Diamond Therapeutics
BDTX
$95.1M
| $34K | ﹤0.01% |
12,300
-93,100
| -88% | -$218K |
|
|
CLSD
6443
CALL
DELISTED
Clearside Biomedical
CLSD
| $34K | ﹤0.01% |
1,947
-53
| -3% | -$756 |
|
6444
CALL
Corvus Pharmaceuticals
CRVS
$1.1B
| $34K | ﹤0.01% |
19,600
+8,600
| +78% | +$12.6K |
|
6445
PUT
Gray Television
GTN
$437M
| $34K | ﹤0.01% |
3,900
+700
| +22% | +$5.21K |
|
6446
Installed Building Products
IBP
$6.21B
| $34K | ﹤0.01% |
188
-2,998
| -94% | -$421K |
|
6447
CALL
Insteel Industries
IIIN
$592M
| $34K | ﹤0.01% |
900
+700
| +350% | +$23.1K |
|
6448
Kadant
KAI
$3.58B
| $34K | ﹤0.01% |
+122
| New | +$30.5K |
|
|
KW
6449
DELISTED
Kennedy-Wilson Holdings
KW
| $34K | ﹤0.01% |
+2,811
| New | +$35.2K |
|
6450
PUT
Loews
L
$24.5B
| $34K | ﹤0.01% |
500
-1,800
| -78% | -$120K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.